ECS-65-20-4 Crystal Oscillator Equivalent & Substitute Parts

Part Overview

The ECS-65-20-4 is a 6.5 MHz through-hole crystal oscillator in HC-49/US package configuration, designed for fundamental mode operation with 20pF load capacitance and 100 Ohms equivalent series resistance. This part carries a "Not For New Designs" status, making identification of suitable alternatives essential for ongoing production and new project implementations. The primary reason for seeking substitutes is the obsolescence trajectory of this legacy component, combined with the need for RoHS compliance in modern applications.

Substiute Parts

ECS-65-20-4

ECS Inc.In Stock: 1303ECS-65-20-4 Datasheet

Current PartRFQ

ECS-65-20-4X

ECS Inc.In Stock: 1917ECS-65-20-4X Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ECS-65-20-4 is determined by strict equivalence across the following critical parameters:

• Frequency: 6.5 MHz (exact match required)
• Frequency Tolerance: ±30 ppm (exact match required)
• Load Capacitance: 20 pF (exact match required)
• ESR: 100 Ohms (exact match required)
• Operating Mode: Fundamental (exact match required)
• Package / Case: HC-49/US (exact match required)
• Mounting Type: Through Hole (exact match required)
• Operating Temperature Range: -10°C to 70°C (exact match required)

The ECS-65-20-4X qualifies as a parametric equivalent substitute because it maintains identical electrical and mechanical specifications across all critical parameters while offering improved product status and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The ECS-65-20-4X is the direct substitute for the ECS-65-20-4. Selection between these parts should be based on the following criteria:

For New Designs and Active Production: Use ECS-65-20-4X. This part maintains Active product status and carries ROHS3 compliance certification, meeting current regulatory requirements and ensuring long-term supply availability.

For Legacy System Maintenance: The ECS-65-20-4 remains available with 1267 pieces in stock. However, transition to ECS-65-20-4X is recommended due to its improved compliance posture and Active status, as the original part is designated "Not For New Designs."

Compliance Considerations: The ECS-65-20-4X provides ROHS3 compliance, whereas the ECS-65-20-4 is RoHS non-compliant. For applications subject to RoHS regulations or customer requirements, ECS-65-20-4X is the mandatory selection.

Frequently Asked Questions (FAQ)

Q: Can ECS-65-20-4X be used as a direct replacement for ECS-65-20-4 in existing designs?

A: Yes. The ECS-65-20-4X is a parametric equivalent with identical electrical specifications (6.5 MHz, ±30 ppm tolerance, 20 pF load capacitance, 100 Ohms ESR), operating mode (Fundamental), package (HC-49/US), and physical dimensions. No circuit modifications are required.

Q: What is the difference between these two parts?

A: The primary differences are product status and compliance. ECS-65-20-4X is Active and ROHS3 compliant, while ECS-65-20-4 is marked "Not For New Designs" and is RoHS non-compliant. All electrical and mechanical parameters are identical.

Q: Are there any package or mounting differences?

A: No. Both parts use the HC-49/US through-hole package with identical physical dimensions (0.447" L x 0.183" W, 11.35mm x 4.65mm) and maximum seated height (0.138" / 4.60mm).

Q: Which part should be specified for new product designs?

A: ECS-65-20-4X should be specified for all new designs. The ECS-65-20-4 carries a "Not For New Designs" designation, indicating it is in obsolescence management.

Q: Are the frequency and load capacitance specifications identical?

A: Yes. Both parts operate at 6.5 MHz with ±30 ppm frequency tolerance and 20 pF load capacitance. ESR is 100 Ohms for both.

Q: What is the operating temperature range for both parts?

A: Both parts operate across -10°C to 70°C. Operating temperature range is identical.